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/*
+----------------------------------------------------------------------+
| Zend Engine |
+----------------------------------------------------------------------+
| Copyright (c) 1998-2011 Zend Technologies Ltd. (http://www.zend.com) |
+----------------------------------------------------------------------+
| This source file is subject to version 2.00 of the Zend license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.zend.com/license/2_00.txt. |
| If you did not receive a copy of the Zend license and are unable to |
| obtain it through the world-wide-web, please send a note to |
| license@zend.com so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Authors: Andi Gutmans <andi@zend.com> |
| Zeev Suraski <zeev@zend.com> |
+----------------------------------------------------------------------+
*/

/* $Id$ */

#ifndef ZEND_EXECUTE_H
#define ZEND_EXECUTE_H

#include "zend_compile.h"
#include "zend_hash.h"
#include "zend_operators.h"
#include "zend_variables.h"

typedef union _temp_variable {
zval tmp_var;
struct {
zval **ptr_ptr;
zval *ptr;
zend_bool fcall_returned_reference;
} var;
struct {
zval **ptr_ptr;
zval *ptr;
zend_bool fcall_returned_reference;
zval *str;
zend_uint offset;
} str_offset;
struct {
zval **ptr_ptr;
zval *ptr;
zend_bool fcall_returned_reference;
HashPointer fe_pos;
} fe;
zend_class_entry *class_entry;
} temp_variable;


BEGIN_EXTERN_C()
ZEND_API extern void (*zend_execute)(zend_op_array *op_array TSRMLS_DC);
ZEND_API extern void (*zend_execute_internal)(zend_execute_data *execute_data_ptr, int return_value_used TSRMLS_DC);

void init_executor(TSRMLS_D);
void shutdown_executor(TSRMLS_D);
void shutdown_destructors(TSRMLS_D);
ZEND_API void execute(zend_op_array *op_array TSRMLS_DC);
ZEND_API void execute_internal(zend_execute_data *execute_data_ptr, int return_value_used TSRMLS_DC);
ZEND_API int zend_is_true(zval *op);
#define safe_free_zval_ptr(p) safe_free_zval_ptr_rel(p ZEND_FILE_LINE_CC ZEND_FILE_LINE_EMPTY_CC)
static inline void safe_free_zval_ptr_rel(zval *p ZEND_FILE_LINE_DC ZEND_FILE_LINE_ORIG_DC)
{
TSRMLS_FETCH();

if (p!=EG(uninitialized_zval_ptr)) {
FREE_ZVAL_REL(p);
}
}
ZEND_API int zend_lookup_class(const char *name, int name_length, zend_class_entry ***ce TSRMLS_DC);
ZEND_API int zend_lookup_class_ex(const char *name, int name_length, int use_autoload, zend_class_entry ***ce TSRMLS_DC);
ZEND_API int zend_eval_string(char *str, zval *retval_ptr, char *string_name TSRMLS_DC);
ZEND_API int zend_eval_stringl(char *str, int str_len, zval *retval_ptr, char *string_name TSRMLS_DC);
ZEND_API int zend_eval_string_ex(char *str, zval *retval_ptr, char *string_name, int handle_exceptions TSRMLS_DC);
ZEND_API int zend_eval_stringl_ex(char *str, int str_len, zval *retval_ptr, char *string_name, int handle_exceptions TSRMLS_DC);

static inline int i_zend_is_true(zval *op)
{
int result;

switch (Z_TYPE_P(op)) {
case IS_NULL:
result = 0;
break;
case IS_LONG:
case IS_BOOL:
case IS_RESOURCE:
result = (Z_LVAL_P(op)?1:0);
break;
case IS_DOUBLE:
result = (Z_DVAL_P(op) ? 1 : 0);
break;
case IS_STRING:
if (Z_STRLEN_P(op) == 0
|| (Z_STRLEN_P(op)==1 && Z_STRVAL_P(op)[0]=='0')) {
result = 0;
} else {
result = 1;
}
break;
case IS_ARRAY:
result = (zend_hash_num_elements(Z_ARRVAL_P(op))?1:0);
break;
case IS_OBJECT:
if(IS_ZEND_STD_OBJECT(*op)) {
TSRMLS_FETCH();

if (Z_OBJ_HT_P(op)->cast_object) {
zval tmp;
if (Z_OBJ_HT_P(op)->cast_object(op, &tmp, IS_BOOL TSRMLS_CC) == SUCCESS) {
result = Z_LVAL(tmp);
break;
}
} else if (Z_OBJ_HT_P(op)->get) {
zval *tmp = Z_OBJ_HT_P(op)->get(op TSRMLS_CC);
if(Z_TYPE_P(tmp) != IS_OBJECT) {
/* for safety - avoid loop */
convert_to_boolean(tmp);
result = Z_LVAL_P(tmp);
zval_ptr_dtor(&tmp);
break;
}
}
}
result = 1;
break;
default:
result = 0;
break;
}
return result;
}

ZEND_API int zval_update_constant(zval **pp, void *arg TSRMLS_DC);
ZEND_API int zval_update_constant_inline_change(zval **pp, void *arg TSRMLS_DC);
ZEND_API int zval_update_constant_no_inline_change(zval **pp, void *arg TSRMLS_DC);
ZEND_API int zval_update_constant_ex(zval **pp, void *arg, zend_class_entry *scope TSRMLS_DC);

/* dedicated Zend executor functions - do not use! */
#define ZEND_VM_STACK_PAGE_SIZE ((64 * 1024) - 64)

struct _zend_vm_stack {
void **top;
void **end;
zend_vm_stack prev;
};

#define ZEND_VM_STACK_ELEMETS(stack) \
((void**)(((char*)(stack)) + ZEND_MM_ALIGNED_SIZE(sizeof(struct _zend_vm_stack))))

#define ZEND_VM_STACK_GROW_IF_NEEDED(count) \
do { \
if (UNEXPECTED((count) > \
EG(argument_stack)->end - EG(argument_stack)->top)) { \
zend_vm_stack_extend((count) TSRMLS_CC); \
} \
} while (0)

static inline zend_vm_stack zend_vm_stack_new_page(int count) {
zend_vm_stack page = (zend_vm_stack)emalloc(ZEND_MM_ALIGNED_SIZE(sizeof(*page)) + sizeof(void*) * count);

page->top = ZEND_VM_STACK_ELEMETS(page);
page->end = page->top + count;
page->prev = NULL;
return page;
}

static inline void zend_vm_stack_init(TSRMLS_D)
{
EG(argument_stack) = zend_vm_stack_new_page(ZEND_VM_STACK_PAGE_SIZE);
}

static inline void zend_vm_stack_destroy(TSRMLS_D)
{
zend_vm_stack stack = EG(argument_stack);

while (stack != NULL) {
zend_vm_stack p = stack->prev;
efree(stack);
stack = p;
}
}

static inline void zend_vm_stack_extend(int count TSRMLS_DC)
{
zend_vm_stack p = zend_vm_stack_new_page(count >= ZEND_VM_STACK_PAGE_SIZE ? count : ZEND_VM_STACK_PAGE_SIZE);
p->prev = EG(argument_stack);
EG(argument_stack) = p;
}

static inline void **zend_vm_stack_top(TSRMLS_D)
{
return EG(argument_stack)->top;
}

static inline void zend_vm_stack_push(void *ptr TSRMLS_DC)
{
ZEND_VM_STACK_GROW_IF_NEEDED(1);
*(EG(argument_stack)->top++) = ptr;
}

static inline void zend_vm_stack_push_nocheck(void *ptr TSRMLS_DC)
{
*(EG(argument_stack)->top++) = ptr;
}

static inline void *zend_vm_stack_pop(TSRMLS_D)
{
void *el = *(--EG(argument_stack)->top);

if (UNEXPECTED(EG(argument_stack)->top == ZEND_VM_STACK_ELEMETS(EG(argument_stack)))) {
zend_vm_stack p = EG(argument_stack);
EG(argument_stack) = p->prev;
efree(p);
  }
return el;
}

static inline void *zend_vm_stack_alloc(size_t size TSRMLS_DC)
{
void *ret;

size = (size + (sizeof(void*) - 1)) / sizeof(void*);

/* the following comparison must be optimized out at compile time */
if (ZEND_MM_ALIGNMENT > sizeof(void*)) {
int extra = (ZEND_MM_ALIGNMENT - ((zend_uintptr_t)EG(argument_stack)->top & (ZEND_MM_ALIGNMENT - 1))) / sizeof(void*);

if (UNEXPECTED(size + extra + ZEND_MM_ALIGNED_SIZE(sizeof(void*)) / sizeof(void*) >
(zend_uintptr_t)(EG(argument_stack)->end - EG(argument_stack)->top))) {
zend_vm_stack_extend(size TSRMLS_CC);
} else {
void **old_top = EG(argument_stack)->top;

EG(argument_stack)->top += extra;
/* store old top on the stack */
*EG(argument_stack)->top = (void*)old_top;
EG(argument_stack)->top += ZEND_MM_ALIGNED_SIZE(sizeof(void*)) / sizeof(void*);
}
} else {
ZEND_VM_STACK_GROW_IF_NEEDED((int)size);
}
ret = (void*)EG(argument_stack)->top;
EG(argument_stack)->top += size;
return ret;
}

static inline void zend_vm_stack_free_int(void *ptr TSRMLS_DC)
{
if (UNEXPECTED(ZEND_VM_STACK_ELEMETS(EG(argument_stack)) == (void**)ptr)) {
zend_vm_stack p = EG(argument_stack);

EG(argument_stack) = p->prev;
efree(p);
} else {
EG(argument_stack)->top = (void**)ptr;
}
}

static inline void zend_vm_stack_free(void *ptr TSRMLS_DC)
{
if (UNEXPECTED(ZEND_VM_STACK_ELEMETS(EG(argument_stack)) == (void**)ptr)) {
zend_vm_stack p = EG(argument_stack);

EG(argument_stack) = p->prev;
efree(p);
} else {
/* the following comparison must be optimized out at compile time */
if (ZEND_MM_ALIGNMENT > sizeof(void*)) {
ptr = (void*)(((char*)ptr) - ZEND_MM_ALIGNED_SIZE(sizeof(void*)));
EG(argument_stack)->top = *(void***)ptr;
} else {
EG(argument_stack)->top = (void**)ptr;
}
}
}

static inline void** zend_vm_stack_push_args(int count TSRMLS_DC)
{

if (UNEXPECTED(EG(argument_stack)->top - ZEND_VM_STACK_ELEMETS(EG(argument_stack)) < count) ||
UNEXPECTED(EG(argument_stack)->top == EG(argument_stack)->end)) {
zend_vm_stack p = EG(argument_stack);

zend_vm_stack_extend(count + 1 TSRMLS_CC);

EG(argument_stack)->top += count;
*(EG(argument_stack)->top) = (void*)(zend_uintptr_t)count;
while (count-- > 0) {
void *data = *(--p->top);

if (UNEXPECTED(p->top == ZEND_VM_STACK_ELEMETS(p))) {
zend_vm_stack r = p;

EG(argument_stack)->prev = p->prev;
p = p->prev;
efree(r);
}
*(ZEND_VM_STACK_ELEMETS(EG(argument_stack)) + count) = data;
}
return EG(argument_stack)->top++;
}
*(EG(argument_stack)->top) = (void*)(zend_uintptr_t)count;
return EG(argument_stack)->top++;
}

static inline void zend_vm_stack_clear_multiple(TSRMLS_D)
{
void **p = EG(argument_stack)->top - 1;
int delete_count = (int)(zend_uintptr_t) *p;

while (--delete_count>=0) {
zval *q = *(zval **)(--p);
*p = NULL;
zval_ptr_dtor(&q);
}
zend_vm_stack_free_int(p TSRMLS_CC);
}

static inline zval** zend_vm_stack_get_arg(int requested_arg TSRMLS_DC)
{
void **p = EG(current_execute_data)->prev_execute_data->function_state.arguments;
int arg_count = (int)(zend_uintptr_t) *p;

if (UNEXPECTED(requested_arg > arg_count)) {
return NULL;
}
return (zval**)p - arg_count + requested_arg - 1;
}

static inline void zend_arg_types_stack_2_pop(zend_ptr_stack *stack, zval **object, zend_function **fbc)
{
void *a, *b;

zend_ptr_stack_2_pop(stack, &a, &b);

*object = (zval *) a;
*fbc = (zend_function *) b;
}

static inline void zend_arg_types_stack_3_pop(zend_ptr_stack *stack, zend_class_entry **called_scope, zval **object, zend_function **fbc)
{
void *a, *b, *c;

zend_ptr_stack_3_pop(stack, &a, &b, &c);

*called_scope = (zend_class_entry *) a;
*object = (zval *) b;
*fbc = (zend_function *) c;
}

void execute_new_code(TSRMLS_D);


/* services */
ZEND_API char *get_active_class_name(char **space TSRMLS_DC);
ZEND_API char *get_active_function_name(TSRMLS_D);
ZEND_API char *zend_get_executed_filename(TSRMLS_D);
ZEND_API uint zend_get_executed_lineno(TSRMLS_D);
ZEND_API zend_bool zend_is_executing(TSRMLS_D);

ZEND_API void zend_set_timeout(long seconds, int reset_signals);
ZEND_API void zend_unset_timeout(TSRMLS_D);
ZEND_API void zend_timeout(int dummy);
ZEND_API zend_class_entry *zend_fetch_class(const char *class_name, uint class_name_len, int fetch_type TSRMLS_DC);
void zend_verify_abstract_class(zend_class_entry *ce TSRMLS_DC);

#ifdef ZEND_WIN32
void zend_init_timeout_thread(void);
void zend_shutdown_timeout_thread(void);
#define WM_REGISTER_ZEND_TIMEOUT (WM_USER+1)
#define WM_UNREGISTER_ZEND_TIMEOUT (WM_USER+2)
#endif

#define zendi_zval_copy_ctor(p) zval_copy_ctor(&(p))
#define zendi_zval_dtor(p) zval_dtor(&(p))

#define active_opline (*EG(opline_ptr))

/* The following tries to resolve the classname of a zval of type object.
* Since it is slow it should be only used in error messages.
*/
#define Z_OBJ_CLASS_NAME_P(zval) ((zval) && Z_TYPE_P(zval) == IS_OBJECT && Z_OBJ_HT_P(zval)->get_class_entry != NULL && Z_OBJ_HT_P(zval)->get_class_entry(zval TSRMLS_CC) ? Z_OBJ_HT_P(zval)->get_class_entry(zval TSRMLS_CC)->name : "")

ZEND_API zval** zend_get_compiled_variable_value(const zend_execute_data *execute_data_ptr, zend_uint var);

#define ZEND_USER_OPCODE_CONTINUE 0 /* execute next opcode */
#define ZEND_USER_OPCODE_RETURN 1 /* exit from executor (return from function) */
#define ZEND_USER_OPCODE_DISPATCH 2 /* call original opcode handler */
#define ZEND_USER_OPCODE_ENTER 3 /* enter into new op_array without recursion */
#define ZEND_USER_OPCODE_LEAVE 4 /* return to calling op_array within the same executor */

#define ZEND_USER_OPCODE_DISPATCH_TO 0x100 /* call original handler of returned opcode */

ZEND_API int zend_set_user_opcode_handler(zend_uchar opcode, user_opcode_handler_t handler);
ZEND_API user_opcode_handler_t zend_get_user_opcode_handler(zend_uchar opcode);

/* former zend_execute_locks.h */
typedef struct _zend_free_op {
zval* var;
/* int is_var; */
} zend_free_op;

ZEND_API zval *zend_get_zval_ptr(znode *node, const temp_variable *Ts, zend_free_op *should_free, int type TSRMLS_DC);
ZEND_API zval **zend_get_zval_ptr_ptr(const znode *node, const temp_variable *Ts, zend_free_op *should_free, int type TSRMLS_DC);

ZEND_API int zend_do_fcall(ZEND_OPCODE_HANDLER_ARGS);

END_EXTERN_C()

#endif /* ZEND_EXECUTE_H */

/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* indent-tabs-mode: t
* End:
*/
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